I really do not think you would have a problem with the heavier sidewall. Doubt you would find much different in towing or in how it treated the camper. My concern is running them under the max rated PSI. I know some do and some manufacturers have charts about it.
You may want to go to
http://www.rvtiresafety.net . A site of a Tire Engineer for over 40 years. Drop Roger a note ~~~